You are NOT ruining her life and with respect, I disagree with your premise.
The love you show your dog...THAT is the most important part.
Sure nearly all dogs could use a bit more exercise, but in terms of THEIR happiness, Love wins out everytime in my opinion. The stability of the family - THAT is number one for the dog.
Also keep in mind, dogs don't think about their longevity...that is a curse reserved only for humans...and your husky is 10 - it needs exercise, but way less than a few years ago.
Keep on doing whatever you can
Barking dog has good advice if it works in your situation.
Good luck!